There are certain subjects guaranteed to put an abrupt end to your domestic bliss. I'm not talking about those big, life-changing blow-ups (like after he announces he doesn't want more kids or you've gambled away your 401[k] on a bad investment). There are plenty of little, seemingly innocuous annoyances that can put a damper on a usually peaceful, happy home. Take a look at the 30 things guaranteed to start a spat with your spouse.